Kepler-65
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Kepler-65 is a subgiant star slightly more massive than the Sun and has at least four planets.
Planetary system
Three transiting planets were announced in 2013. A fourth non-transiting planet was discovered using radial velocity measurements in 2019. The first three planets orbit very close to their star. Initial follow-up radial velocity measurements provided data too noisy to constrain the mass of planets. Follow-up transit-timing variation analysis helped to measure the mass of Kepler-65d which revealed that it has significantly lower density than Earth.
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 2.4+2.4 −1.6 M🜨 | 0.035 | 2.1549209+0.0000086 −0.0000074 | 0.028+0.031 −0.02 | 92.2+1.3 −1.4° | 1.444+0.037 −0.031 R🜨 |
| c | 5.4±1.7 M🜨 | 0.068 | 5.859697+0.000093 −0.000099 | 0.02+0.022 −0.013 | 92.33+0.29 −0.26° | 2.623+0.066 −0.056 R🜨 |
| d | 4.14+0.79 −0.80 M🜨 | 0.084 | 8.13167+0.00024 −0.00021 | 0.014+0.016 −0.010 | 92.35+0.18 −0.16° | 1.587+0.040 −0.035 R🜨 |
| e | 200+200 −50 M🜨 | — | 258.8+1.5 −1.3 | 0.283+0.064 −0.071 | 127.0+27.0 −25.0° | — |